Feed mechanism for metal-working machines.



No. 674,l36. Patented May l4, l90l.

E HUHN. &. W. VON PITTLER. I FEED MECHANISM FOR METAL WORKING MACHINES.

(Application filed Jan. 18, 1901.

2 ShaatsSheet I.

(No Model.)

WITNESSES P Du E L h P N 0 v W & N H u H L FEED'MEOHANISM FOR METAL WDRKING MACHINES.

(Application filed Jan. 18, 1901.

2 Shoets8hagt 2.

(No Model.)

W/ T/VE SSE S 1n: Mom-us PETERS co.. PHOYcflumcL. WASHINGTON u. c

NITED TATES ATE FICE ERNST HUHN, OF LEIPSIO-GOHLIS, AND WILHELM VON PITTLER, OF LEIP SIO-WAHREN, GERMANY, ASSIGNORS TO THE LEIPZIGER. WERKZEUG- MASCHINEN-FABRIK, VORM. W. V. PITTLER AKTIENGESELLSOHAFT, OF

LEIPSIO-WAHREN, GERMANY.

FEED MECHANISM FOR METAL-WORKING MACHINES.

SPECIFICATION formingpart of Letters Patent No. 674,136, dated May 14, 1901. Application filed January 18, 1901. Serial No. 48,752- (No model.)

T at whmn it may concern.-

Be it known that we, ERNST HUHN, residing in Leipsic-Gohlis, and WILHELM VON PITT- LER, residing in Leipsic-Wahren, in the Kingdom of Saxony, Germany, citizens of the Empire of Germany, have invented certain new and useful Improvements in Feed Mechanism. for Metal-Working Machines, of which the following is a specification.

1o The invention relates to feed mechanism which is intended to be used with metal-working machines, such as turning-Lathes and other machines, and which is intended for the purpose of feeding the object to be operated on during the motion of the machine through the hollow working-spindleof the same, so as to subject the object to the different operations required. The feeding device can be readily adjusted for the various thicknesses of objects and is automatically thrown in or out of action through the medium of a chuck and intermediate'lever mechanism.

For the purpose described the invention consists of feed mechanism for metal-working machines, which comprises conical friction-rollers, worm-gears for rotating the same through the medium of the hollow workingspindle, means for adjusting the said frictionrollers to the diameter of the object to be fed, and means for steadying the work while the same is fed forward, as will be fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 ourimproved feed mechanism for metal-working machines. Fig. 2 is a vertical transverse section of the same on line 2 2, Fig. 1. Fig. 3 is an end elevation of the device, showing the material to be operated on in section. Fig. 4 is a horizontal section on line 4 4, Fig. 2; and Fig. 5 is also a vertical transverse section showing a modification in which in place of worm-gears hyperbolic gears are used.

Similar letters of reference indicate corresponding parts.

Our improved feed mechanism consists of a casing a, which is firmly connected with the represents a vertical longitudinal section of be directly placed in the feed device and fed end of the hollow working-spindle z of a portion y of the metal-working machine by means of a hub a, which is screwed on or otherwise connected with the spindle z. On the hub a of the casing a is mounted a ring I), to which a worm-gear c is suitably keyed, said ring turning freely on the hub a and its ringshaped retaining-plate ta that is suitably fastened to the hub a. The worm-wheel c meshes with two worms d d, (shown in Fig. 4 and in dotted lines in Fig. 2,) which are mounted at opposite sides of the worm-wheel c, said worms being keyed to shafts e 6', respectively, which are suitably journaled in parallel position in the casing 11. The worms d d are also placed in mesh with worm-gears f f which are supported on shafts g g, that turn on conical bearing-points h, which are supported in the casing a. On the shafts g g are mounted conical friction-rollers-z' i, said friction-rollers being splined to the shafts g 9, so as to be shiftable thereon. The friction-rollers are provided with elongated hubs, to which the rings is k, respectively, are attached. On

the hubs of the friction-rollers M are also arranged movable collars Z Z,which abut against the rings k is and are pressed against the same by means of spiral springs m m, interposed between the inner ends of the frictionrollers 'i t and the collars Z Z. The piece of worknpasses through the center of the casing a, between the friction-rollers i 2", the latter 8o having contact therewith at diametrically opposite points. 7

In order that rods 02, of different diameter can by the same, the rotary cover 0 of the casing a is provided with two arc-shaped slots '10 p, which are located eccentri'cally to the vertical center plane of the feed'devic'e, as shown i in Fig.3. In the slotspp are guidedthe heads of screws q g, which are connected with the said collars Z Z, mounted on the hubs of the friction-rollers 2' t". The feed device is so constructed that the largest size of rods that can be fed through the hollow working spindle a can be taken hold of by the friction- 5 rollers 71 i. If the rod or is of smaller diameter, the screws q q are loosened and the cover is turned toward the right until the proper position of the friction-rollers is obtained. As the slots 19 p are located eccentrically to the vertical central plane of the cover and casing 01,, the screws q qare shifted toward the center of the casing, but parallel with each other. The friction-rollers d t" are compelled by the collars Z Z, which are connected with the screws q q, to move on their shafts g g, so that the friction-rollers approach each other. The cover 0 is turned until the friction-rollers 1; t" are so close to each other that the distance between their conical surfaces corresponds to the diameter of the rod to be worked upon. As soon as the rollers t' t" are adjusted to their proper position the screws q q are tightened again. The spiral springs m m, which are located between the collars Z Z and the interior of the friction-rollers t' t, have the object to overcome any unevenness in the rod '11., which is fed forward, said friction-rollers giving sufficiently so that these irregularities have no influence on the proper functioning of the feed device. To prevent a lateral motion of the rod n, set-screws 9" 1' (see dotted lines, Figs. 1 and 2) are arranged sidewise of the same in the casing a, which set-screws are properly adjusted to the diameter of the rod n.

If desired, three friction-rollers may be used with corresponding shafts and wormgears. In this case, however, the frictionrollers have to be set at a distance from each other equal to one-third of the circumference of the object to be operated on. In this case the set-screws 0" might be omitted; but three worms d have to be used for imparting motion to the three friction-rollers.

In place of the worm-gear transmission a, d, and f other motion-transmitting gears may be used. Fig. shows an arrangement in which hyperbolic Wheels are used. The hyperbolic wheel 0 is arranged similar to the worm-gear 0 before described and meshes with the bevel gear-wheels f f which are supported in the same manner in the casing as the wormsf f of the arrangement shown in Fig. 4:. Any other motion-transmitting mechanism may be employed for transmitting the motion from the gear-wheel o to the friction-rollers it, as we do not desire to confine ourselves to the special arrangement shown.

Our improved feed mechanism for metalworking machines is operated as follows: The friction-rollers it, as well as the regulating set-screws 0' r, are accurately adjusted to the diameter of the object it to be operated on. The object it is intended to be fed forward during the motion of the working spindle by the feed device. This is accomplished whenever the motion of the ring I) is arrested by the stops, (shown in Fig. 1,) which is operated by a suitable lever connection with the chuck, so as to engage in the notch or recess 15 in the circumference of the ring I). The engagement of the rod 3 with the notch i will immediately stop the motion of the ring I) and the worm-gear c on the same. As the casing, with its worm-gear transmission,continuesits motion, the worms d d are turned on their axes by their interineshing with the now stationaryworm-gear c. The worms (1 d transmit the motion to the worms ff and by the same to the shafts g g and the friction-rollers 'i 'i'. As the friction-rollers it are pressed against the object it by the springs m m, the object it is taken along by the friction-rollers it" and fed forward by the same. As soon as the forward motion of the object it is arrested by any suitable stop device it is compelled to glide between the friction-rollers ii. By disengaging the stop 5 from the notch or recess t of the ring I) the worm-gear c is re leased and will then rotate with the entire feed device, so that the turning of the friction-rollers v1 2" will be discontinued. The operation of the motion-transmitting device shown in Fig. 5 is the same, for the reason that as soon as the motion of the hyperbolic wheel 0 is stopped the beveled gear-wheels f the shafts g g, and the friction-rollers it are immediately set in motion.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. In feed mechanism for metal-working machines, the combination of a casing, rotary shafts journaled in said casing, and conical friction-rollers mounted on said shafts, said friction-rollers being adjustable, along said shafts, to the diameter of the piece 'of work passed through the feed mechanism, substantially as set forth.

2. In feed mechanism for metal-working machines, the combination of a casing provided with a rotary cover having arc-shaped slots, screws guidedin said slots, conical friction-rollers at the interior of the casing, shafts for supporting said friction-rollers, devices for engaging the hubs of the friction-rollers, and connected with the screws,and springs between the said engaging devices and the friction-rollers whereby through the adjustment of the screws in the eccentric slots, the friction-rollers can be accurately adjusted to the diameter of the object conducted through the feed mechanism, substantially as set forth.

3. In feed mechanism for metal-working machines, the combination of a casing provided with a hub, a ring placed loosely on said hub, a worm-gear secured to said ring, a worm-gear transmission, friction-rollers operated by said worm-gear transmission, and means for arresting the motion of the loose ring so as to rotate the friction-rollers by the actuation of the transmitting-gears and exert thereby a friction on the object passing through the casing and feed the same forward, substantially as set forth.

4. In feed mechanism for metal-working machines, the combination of conicalfrictionrollers provided with extended hubs, shafts our invention we have signed our names in on which the rollers are slidingly mounted, presence of two subscribing witnesses.

rings on said hubs, collars provided with ERNST HUHN screws for adjusting said friction-rollers on their shafts, and springs interposed between WILHELM VON PITTLER the collars and the inner ends of the friction- Witnesses:

rollers, substantially as set forth. RICHARD VOIGTLANDER,

In testimony that we claim the foregoing as CHAS. J. BURT. 

